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What are fundamental forces in Nature?
Earth's gravitational force, Electromagnetic force, Nuclear force
What are uses of electromagnet?
Electric winches, Electric bells
GR: Lubricating and oiling of mechanical machines?
to reduce the friction between moving parts to prevents their erosion
Infrared rays are used in.......................
Night vision, cooking food, remote sensing instruments.
this figure represents.....................motion.
circular
If you are in a stopping car and another car is moving forward beside you, you will imagine your car ...............
moving backward
Visible light used in ....................
TV cameras, photographic cameras, Light show
The relation between the friction force and the speed of the object is......................
inverse
What are forces originate due to motion?
Inertia, Friction
Electric motor changes .................into..................... and it is used in...............
Electric, Kinetic , Mixer
What is the type of motion?
Transitional
GR: We can see lightning before hearing thunder.
Electromagnetic waves, mechanical waves.
GR: Blood is pumped all over the body organs?
Due to Heart muscles contraction and relaxation.
Mention types of periodic motion?
Wave, Circular , Vibrating motion.
Mention one use of gamma rays?
Medical purposes
What is  the idea of electromagnet?
Electric energy - Magnetic energy
GR: Importance of nuclear force.
Medicine, industry, Scientific researches, production of electric energy, Military proposes